Carrier 42N Installations- Und Bedienanweisungen Seite 24

Controls
Light indicators
Green LED
ON cooling mode ( ).
Flashing frost protection mode ( ).
Red LED
ON heating mode (
Flashing Presence of a fault (sensor failed or not
connected).
Yellow LED (A ) (only 4-pipe versions)
ON automatic mode (A).
Green LED + yellow LED
Both ON automatic mode (A) - cooling ( ).
Red LED + yellow LED
Both ON automatic mode (A) - heating (
Yellow LED ( )
ON energy saving mode .
Flashing External contact is open.
Red / green LED
Flashing "Autotest" mode.
Dip-switch functions (See fig.34)
Dip-switch No. 1
When ON permits enabling the frost
protection ( ) function.
OFF Frost protection ( ) disabled.
ON Frost protection ( ) enabled.
Dip-switch No. 2
When ON permits fan operation at the selected speed even if the
set point is satisfied.
OFF Ventilation controlled by thermostat.
ON Continuous ventilation.
Dip-switch No. 3
When ON in cooling ( ) mode, restricts the range of temperature
selection, according to the following limits:
Cooling: minimum selectable temperature: 25°C.
Heating: maximum selectable temperature: 20°C.
OFF Temperature block disabled.
ON Temperature block enabled.
Dip-switch No. 4
When ON periodically activates the fan even if the set point is
satisfied (air sampling).
OFF Air sampling disabled.
ON Air sampling enabled.
22 42N
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NOTE:
Factory setting is with all dip-switches in the OFF position.
Use of temperature sensor (See fig.35)
Internal sensor:
This is used in all installations where the control is wall-mounted.
To activate it, close jumper JP1 as shown in figure 35.
Remote sensor:
This is used on all installations with unit-mounted control. It is
positioned on the return air, close to the fan.
To activate it, close jumper JP1 as shown in figure 35.
NOTE:
Factory setting is with activated remote sensor.
Diagnostic warnings
The following alarm situations are indicated:
Defective sensors: the red LED flashes.
Possible causes:
• failure or short circuit of internal or remote sensor;
• failure or short circuit of water temperature sensor (optional and
only on type "A" control).
Incorrect configuration
The yellow LED flashes.
This happens when:
• in type "A" control, both centralised seasonal changeover signals
"RC and RH" are enabled.
Autotest
The autotest function is activated by holding the seasonal
changeover button pressed and at the same time pressing the " "
button three times within 1 second.
In this way it is possible to check the starting of all fan coils.
The green and red LEDs will begin to flash.
Each of the various units will be activated for 10 seconds in the
following sequence:
Low fan speed.
Medium fan speed.
High fan speed.
CV Motorized cold-water valve.
HV Motorized hot-water valve, or electric heater (only type "B"
control versions).
Elapsed 1 minute the control ends the test mode.